从教科书（《C语言程序设计》（第二版）主编 丁亚涛，p174）上照抄的一个程序：

#include <math.h>
#include<stdio.h>
float integeral(double(*funp)(),float a,float b)
{
    float  s,h,y;
    int  n,i;
    s=((*funp)(a)+(*funp)(b))/2.0;  /*[f(a)+f(b)]/2作为求和的初值*/
    n=100;h=(b-a)/n;
    for (i=1;i<n;i++)
        s=s+(*funp)(a+i*h);
    y=s*h;
    return(y);
}
double  f(double x)
{
    return(sqrt(4.0-x*x));
}
main()
{
    float  s1,s2,s3;
    s1=integeral(sin,0.0,3.1415926/2);
    s2=integeral(cos,0.0,3.1415926/2);
    s3=integeral(f,0.0,2.0);
    printf("s1=%f,s2=%f,s3=%f\n",s1,s2,s3);
}
在VC6上编译时候提示“cpp(7) : error C2197: 'double (__cdecl *)(void)' : too many actual parameters”
“cpp(21) : error C2664: 'integeral' : cannot convert parameter 1 from 'double (double)' to 'double (__cdecl *)(void)'
        None of the functions with this name in scope match the target type”
怎么回事？怎么解决？谢谢